could anyone tell me how to figure out the negative and positive on rear speakers on a..

[downnout]

...02 chevy cavalier? Im adding after market speakers and there are 4 wires going to the old factory speakers colors ranging from yellow to brown. total of 8 with no stripes to indicate what is negative or does it really matter

 

[Charlie]

You could try this site.......http://installdr.com/